List-of-Chords.com

Gb

The root of the chord is always the easiest to find because its name is in the name of the chord!

The root of a Gb Six Nine Chord chord is Gb

Bb

The third of a Gb Six Nine Chord chord is Bb. The third is up four half-steps from the Root.

Eb

The major sixth of a Gb Six Nine Chord chord is Eb. The major sixth is down three half-steps from the Root (a minor third down).

In diminished chords, the major sixth is also known as the diminished seventh. For the purposes of this tutorial, we'll be learning it as the major sixth, since it's easier to consider it separately than the other two sevenths, the major seventh (M7) and minor seventh (m7)

Ab

The ninth of a Gb Six Nine Chord chord is Ab. The ninth is the same as a major second, only up an octave. You can either think of it as up two half-steps from the root, or in relationship to the third. If the chord has a major third, the 9th is down two half-steps. If the chord has a minor third, the 9th is the next piano note down from the minor third.